Tegra3-Hotplug:

- down_delay to 1sec needed by scheduler
- remove useless stuff
- no cluster switching delay
- penalty for slow cpu rates
- conservative thresholds
- refactoring

Signed-off-by: SkipXS <sskkiipp@gmail.com>
defconfig: 2.3 stable

Signed-off-by: SkipXS <sskkiipp@gmail.com>